A `#include` cleanup in the *.h files

[rmisev]

• Add directly used header files

• Remove unused header files

• Update copyright year

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.74%. Comparing base (4cefcbe) to head (c40a6f4).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #46 +/- ## ======================================= Coverage 99.74% 99.74% ======================================= Files 16 16 Lines 2322 2322 Branches 386 386 ======================================= Hits 2316 2316 Misses 6 6 ```

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